棉铃虫对转Bt基因棉的抗性及其治理策略研究进展

Progress in the studies on Helicoverpa spp. resistance to transgenic Bt cotton and its management strategy

简述了苏云金杆菌Bacillusthuringiensis (Bt)毒素的作用方式及杀虫机理 ,分析了Bt棉种植过程中面临的生态风险。综述了昆虫对Bt毒素的抗性机理、监测方法及治理策略方面的研究进展。棉铃虫对Bt棉的抗性可能主要与中肠上皮细胞膜上的特异性结合受体中结合位点的改变有关。在多种抗性治理策略中 ,庇护所策略被公认为是目前最有效的并已广泛采用的抗性治理措施。应针对Bt棉在我国的种植情况 ,在棉铃虫还未在田间表现出抗性以前 ,制定合理的抗性预防。

Advance in the research on monitoring and management strategies of resistance of Helicoverpa spp. to the transgeneticBt% cotton was reviewed. Mechanism and pattern of Bacillus thuringiensis toxicity to pests were included and potential ecological risks of commercially plantedBt% cotton, of which resistance of insect pests toBt% cotton may be the major one, were analyzed. Based on the information available it seems that modification of the site, where the Bt toxin and the specific receptor in the infected insect was bound, may be the most significant mechanism of the resistance occurrence in the Lepidoptera insect. The refuge tactic, considered as one of the effective strategies for resistance management, has been adopted in Australia and US. Since the transgenic cotton has been planted in China, it is necessary to develop effective strategies to manage the resistance before the cotton bollworm develops resistance in the field.